Inhibitory effects of multicomponent, phosphonate-grafted, zwitterionic chitosan biomacromolecules on silicic acid condensation.
This article reports the inhibitory effects of phosphonated chitosan (PCH, synthesized from chitosan (CHS) by a Mannich-type reaction) on the in vitro silicic acid condensation. In particular, the ability of PCH to retard silicic acid condensation in aqueous supersaturated solutions at circumneutral pH is studied. Furthermore, the effect of anionic carboxymethyl inulin (CMI) polyelectrolyte on the inhibitory activity of PCH is systematically studied. It was discovered that when PCH is added in dosages up to 150 ppm, it can inhibit silicic acid condensation, thereby maintaining soluble silicic acid up to 300 ppm (for 8 h, from a 500 ppm initial stock solution). The addition of CMI to working solutions that already contain PCH can further enhance the inhibitory action of PCH. A combination of 150 ppm PCH and 100 ppm CMI maintains 400 ppm soluble silicic acid for 8 h. PCH and CMI combinations also affect colloidal silica particle morphology.
Demadis
Konstantinos D
KD
Crystal Engineering, Growth and Design Laboratory, Department of Chemistry, University of Crete, Voutes Campus, Heraklion, Crete GR-71003, Greece. demadis@chemistry.uoc.gr
Ketsetzi
Antonia
A
Pachis
Konstantinos
K
Ramos
Viviana M
VM
D048271:Chitosan / Q000138:chemical synthesis / Q000737:chemistry*; D063065:Organophosphonates / Q000737:chemistry*; D012824:Silicic Acid / Q000737:chemistry*; D012822:Silicon Dioxide; D012996:Solutions
D063065:Organophosphonates; D012996:Solutions; D012824:Silicic Acid; D012822:Silicon Dioxide; D048271:Chitosan